SteelBell Filled 40 lb Tough & Versatile, steel filled. Hyperwear SteelBells are powerful free weights that will take your training to a new level of intensity. This functional workout tool will challenge and work new muscles every time you use it. Constructed from thick, texturized neoprene, the Hyperwear SteelBell is filled with dense, steel shot that moves around quickly inside the bell. Due to the combination of inertia and the shifting steel shot, a SteelBell feels and responds like a much heavier weight. Use it like a kettle bell, medicine ball, dumbbell or any other free weight and you'll give your muscles a new type of burn while simultaneously strengthening grip, wrist and forearm muscles with every exercise. Twice as dense and demanding as a Hyperwear SandBell, the SteelBell is the perfect tool for athletes to train for explosive power, strength and muscle endurance. Popular for Crossfit, MMA, obstacle racing, military, police, professional and college strength and conditioning programs.